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5
Operation
5.4 Health Index
The Health Index shows PM
air quality; a factor of 7 indicates an extremely hazardous condition. The
Health Index is defined by the EPA (Environmental Protection Agency in the
US), refer to the table below.
Health
Index
1
2
3
4
5
6
7
#NAS100144; r. AC/95652/95652; en-US
as a factor (1 to 7). A factor of 1 indicates good
2.5
Description
Good
Moderate
Unhealthy for sensitive people
Generally unhealthy
Very unhealthy
Hazardous
Extremely hazardous
Range (µg/m
3
, 24 hour average)
0.0 to 12.0
12.1 to 32.4
35.5 to 55.4
55.5 to 150.4
150.5 to 250.4
250.5 to 350.4
350.5 to 500
7
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